Next airing Fri Dec 11, 7 p.m. ET

Killer Whale

Killer whales are smart, lethal and social -- and unlike their archenemy, the great white shark, killer whales hunt in packs. We'll see how they work together to stun tiny herrings with sound, immobilize stingrays by flipping them upside down, wash sleeping seals off ice floes and bludgeon the mighty blue whale. The killer whale has the speed, strength and sophisticated hunting skills to attack the legendary great white shark, the largest predatory fish on earth. It's the ultimate showdown.